Work

Beacons in the Dark: Using Novae and Supernovae to Detect Dwarf Galaxies in the Local Universe

Year: 2015

Type: article

Abstract: We propose that luminous transients, including novae and supernovae (SNe), can be used to detect the faintest galaxies in the universe. Beyond a few megaparsecs, dwarf galaxies with stellar masses will likely be too faint and/or too low in surface brightness to be directly detected in upcoming large area ground-based photometric surveys. However, single-epoch Large Synoptic Survey Telescope photometry will be able to detect novae to distances of ∼30 Mpc and SNe to gigaparsec-scale distances. Depending on the form of the stellar mass–halo mass relation and the underlying star formation histories of low-mass dwarfs, the expected nova rates will be a few to ∼100 yr −1 and the expected SN rates (including both type Ia and core-collapse) will be within the observable ( sr) volume. The transient rate associated with intrahalo stars will be comparably large, but these transients will be located close to bright galaxies, in contrast to the dwarfs, which should trace the underlying large-scale structure of the cosmic web. Aggressive follow-up of hostless transients has the potential to uncover the predicted enormous population of low-mass field dwarf galaxies.

Source: The Astrophysical Journal Letters

DOI: 10.1088/2041-8205/805/1/l2

Authors: Charlie Conroy, James S. Bullock

Institutions: Harvard University, University of California, Irvine

Language: English

Topic: Gamma-ray bursts and supernovae

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: bronze

Funders: National Science Foundation, Kavli Institute for Theoretical Physics, University of California, Santa Barbara

Awards: G4773563968, G6771358743